Spiraali

#include <bits/stdc++.h>

using namespace std;

long long n, t;

long long start;

long long get(long long p)
{
    return n * n + p * ((-4 * (p - 1) * 2 - 4) / 2) - p;
}

int main(int argc, char **argv)
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> t;

    long long centerX = n / 2 + 1;
    long long centerY = n / 2;

    for (long long i = 0; i < t; i++)
    {
        long long x, y;
        cin >> y >> x;
        long long rengas = max(abs(centerX - x), abs(centerY - y));
        long long arvo = get(rengas);

        if (y == centerY + rengas && x < centerX + rengas)
        {
            arvo += rengas;
            arvo += x - (centerX - rengas);
        }
        else if (x == centerX - rengas)
        {
            arvo += y - centerY;
        }
        else if (y == centerY - rengas)
        {
            arvo -= rengas;
            arvo -= x - (centerX - rengas);
        }
        else
        {
            arvo -= rengas + 2 * (rengas - 1);
            arvo -= y - centerY + rengas + 2;
        }

        cout << arvo << "\n";
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED